CN114639830A - Visual lithium ion electrode, application and visual lithium ion battery - Google Patents
Visual lithium ion electrode, application and visual lithium ion battery Download PDFInfo
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- CN114639830A CN114639830A CN202011485951.4A CN202011485951A CN114639830A CN 114639830 A CN114639830 A CN 114639830A CN 202011485951 A CN202011485951 A CN 202011485951A CN 114639830 A CN114639830 A CN 114639830A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 175
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 175
- 230000000007 visual effect Effects 0.000 title claims abstract description 123
- 239000007773 negative electrode material Substances 0.000 claims abstract description 15
- 239000007774 positive electrode material Substances 0.000 claims abstract description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 11
- 238000004806 packaging method and process Methods 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 229920006255 plastic film Polymers 0.000 claims description 13
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- 239000003792 electrolyte Substances 0.000 claims description 10
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- 238000000576 coating method Methods 0.000 claims description 9
- 229920001721 polyimide Polymers 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000013543 active substance Substances 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229920006254 polymer film Polymers 0.000 claims description 4
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 4
- GKWLILHTTGWKLQ-UHFFFAOYSA-N 2,3-dihydrothieno[3,4-b][1,4]dioxine Chemical compound O1CCOC2=CSC=C21 GKWLILHTTGWKLQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 claims description 2
- 239000004962 Polyamide-imide Substances 0.000 claims description 2
- 239000004697 Polyetherimide Substances 0.000 claims description 2
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 2
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 2
- 229920000172 poly(styrenesulfonic acid) Polymers 0.000 claims description 2
- 229920002312 polyamide-imide Polymers 0.000 claims description 2
- 229920006267 polyester film Polymers 0.000 claims description 2
- 229920001601 polyetherimide Polymers 0.000 claims description 2
- 229940005642 polystyrene sulfonic acid Drugs 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 12
- 230000008859 change Effects 0.000 abstract description 8
- 238000007599 discharging Methods 0.000 abstract description 5
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- 230000000052 comparative effect Effects 0.000 description 8
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- 238000012360 testing method Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- 238000007731 hot pressing Methods 0.000 description 4
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- 229910002991 LiNi0.5Co0.2Mn0.3O2 Inorganic materials 0.000 description 2
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- 238000011161 development Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
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- 238000000879 optical micrograph Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
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- 239000011889 copper foil Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention belongs to the technical field of lithium ion batteries, and discloses a visual lithium ion electrode, application and a visual lithium ion battery. The electrode comprises a transparent current collector film and a negative electrode active material or a positive electrode active material coated on the surface of the transparent current collector film. The visual lithium ion electrode is applied to the lithium ion battery to obtain two visual lithium ion batteries. The visual lithium ion battery can be used for in-situ observation of structural change, color change, gas production condition and lithium separation condition of a positive electrode material or a negative electrode material in an electrochemical reaction process in the charging and discharging processes of the battery.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a visual lithium ion electrode, application and a visual lithium ion battery.
Background
The lithium ion battery is a new generation of rechargeable battery following the traditional storage battery such as nickel-hydrogen battery, and the characteristics of high capacity and long service life of the lithium ion battery are widely applied to the fields of energy storage, electric automobiles, portable electronic products and the like. With the development of lithium ions, especially the development of electric vehicles, higher requirements are put on the specific energy, the service life, the safety and the price of lithium ion batteries. This prompted us to investigate further the complex electrochemical transport mechanisms in the cell. The electrochemical mechanism is closely related to the structural evolution of the electrode material in the charging and discharging processes. And the correlation between the electrochemical mechanism and the material of the battery is difficult to monitor in situ by the prior art. Recently, researchers have produced a functional transparent battery which is advantageous for basic research of the battery. However, the energy density of the transparent battery is lower than that of a common lithium battery, and the application range is limited. CN104037388A also discloses a transparent battery, which proposes at least one electrode material with one or more internal structures and a transparent or translucent holder, then a transparent or translucent conductive film is deposited according to the shape of the holder, and positive and negative electrode materials are deposited on the conductive film, and the positive and negative electrode materials are separated by a solid electrolyte. The battery has poor operability, can only be used as a functional battery, and has limited commercial application.
Therefore, there is a need for a new visualized lithium ion electrode and battery.
Disclosure of Invention
The invention aims to provide a visual lithium ion electrode, application and a visual lithium ion battery aiming at the defects of the prior art. The visual lithium ion battery can be used for in-situ observation of structural change, color change, gas production condition and lithium separation condition of a positive electrode material or a negative electrode material in an electrochemical reaction process in the charging and discharging processes of the battery.
In order to achieve the above object, a first aspect of the present invention provides a visual lithium ion electrode, which includes a transparent current collector thin film and a negative electrode active material or a positive electrode active material coated on a surface of the transparent current collector thin film.
The invention also provides application of the visual lithium ion electrode in a lithium ion battery.
In a third aspect, the invention provides a visual lithium ion battery, which comprises one or more groups of positive electrodes and negative electrodes, electrolyte and a celgad diaphragm arranged between the positive electrodes and the negative electrodes; the positive electrode and the negative electrode are both the visual lithium ion electrode; the packaging of the lithium ion battery is full packaging by using a transparent battery packaging film, or after packaging by using an aluminum plastic film, a window is arranged on the aluminum plastic film, and the window part is packaged by using the transparent battery packaging film.
The invention provides a visual lithium ion battery, which comprises one or more groups of positive electrodes and negative electrodes, electrolyte and a diaphragm which is arranged between the positive electrodes and the negative electrodes; the negative electrode consists of a non-visual lithium ion negative electrode and the visual lithium ion negative electrode, and the positive electrode is a non-visual lithium ion positive electrode; after the non-visual lithium ion negative electrode and the non-visual lithium ion positive electrode are crossed and laminated, the visual lithium ion negative electrode is arranged on two sides of an electrode group after the crossed and laminated, and a diaphragm between the electrode group after the crossed and laminated and the visual lithium ion negative electrode is a celgad diaphragm; the packaging of the lithium ion battery is full packaging by using a transparent battery packaging film, or after packaging by using an aluminum plastic film, a window is arranged on the aluminum plastic film, and the window part is packaged by using the transparent battery packaging film.
The technical scheme of the invention has the following beneficial effects:
(1) the visual lithium ion battery can be used for in-situ observation of structural change, color change, gas production condition and lithium separation condition of the anode or cathode material in the electrochemical reaction process in the charging and discharging processes of the battery, and does not influence the energy density of the battery.
(2) The visual lithium ion electrode can be applied to a general lithium ion battery for safety early warning.
(3) The visualized lithium ion battery can be applied to electrochemical mechanism research and lithium analysis research and can also be applied to the field of 3C.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic diagram of a visualized lithium ion battery and an electrode provided in embodiment 1 of the present invention.
Fig. 2 shows a graph of capacity (ah) -voltage (v)) of a visualized lithium ion battery provided in embodiment 1 during a pre-charge pumping and non-pumping charging process.
Fig. 3 shows an ICA diagram for visualizing the charging process of the lithium ion battery during pre-charge pumping and non-pumping provided in embodiment 1 of the present invention. (wherein the abscissa Voltage represents the Voltage and the ordinate dQ/dV/AhV-1Indicating voltage plateau variation)
Fig. 4 shows a uniform lithium deposition map of the surface of a positive electrode of a visual lithium ion battery provided in embodiment 1 after battery disassembly without pumping and charging.
Fig. 5 shows a schematic diagram of a 3Ah composite pole piece visualized lithium ion battery and an electrode provided in embodiment 2 of the present invention.
Fig. 6 shows an EIS (electrochemical impedance spectroscopy) comparison graph of a 3Ah composite pole piece visualized lithium ion battery provided in embodiment 2 of the present invention and a non-visualized lithium ion battery provided in comparative example 1.
Fig. 7(a) shows a graph comparing HPPC power (P/W) of a 3Ah composite pole piece visual lithium ion battery provided in embodiment 2 of the present invention with a non-visual lithium ion battery provided in comparative example 1 in (DIS (discharge) -DOD (discharge state)).
Fig. 7(b) shows a graph comparing HPPC power (P/W) of a 3Ah composite pole piece visualized lithium ion battery provided in embodiment 2 of the present invention with a non-visualized lithium ion battery provided in comparative example 1 in (CHA (charge) -DOD (discharge state)).
Fig. 8 shows an optical microscope image before charging of a 3Ah composite pole piece visualized lithium ion battery provided in embodiment 2 of the present invention.
Fig. 9 shows an optical microscope image of a fully charged state of a 3Ah composite pole piece visualized lithium ion battery provided in embodiment 2 of the present invention.
Fig. 10 shows a schematic diagram of a visualized lithium ion battery and an electrode provided in embodiment 3 of the present invention.
The reference numerals are explained below:
1-visual lithium ion battery;
11-visual lithium ion negative electrode;
12-visual lithium ion positive electrode;
111-visualization of the active material layer of the lithium ion negative electrode;
112-current collector of visual lithium ion negative electrode;
113-negative tab of visual lithium ion negative electrode;
121-active material layer of visual lithium ion positive electrode;
122-current collector of visual lithium ion positive electrode;
123-positive tab of visual lithium ion positive electrode;
2-3Ah composite pole piece visual lithium ion battery;
23-visual lithium ion negative electrode;
24-non-visual lithium ion positive electrode;
25-non-visual lithium ion negative electrode;
231 — visualization of active material layer of lithium ion negative electrode;
232-current collector of the visualized lithium ion negative electrode;
241-active material layer of non-visual lithium ion anode;
242-current collector of non-visual lithium ion positive electrode;
251-active material layer of non-visual lithium ion negative electrode;
252-current collector of non-visual lithium ion negative electrode;
3-visual lithium ion battery;
31-visual lithium ion negative electrode coated on both sides;
32-double coated visual lithium ion positive electrode;
33-a visual lithium ion negative electrode coated on one side;
311-active material layer of visual lithium ion positive electrode coated on both sides;
321-negative electrode ears of a visual lithium ion negative electrode coated on two sides;
322-positive tab of visual lithium ion positive electrode coated on both sides;
331-active material layer of visual lithium ion negative electrode coated on one side.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a visual lithium ion electrode, which comprises a transparent current collector film and a negative electrode active material or a positive electrode active material coated on the surface of the transparent current collector film.
In the invention, the transparent current collector film is a conductive, acid-resistant and electrochemical corrosion-resistant transparent current collector film, and preferably, the transparent current collector film is selected from a metal film system with the thickness of 8-12nm, an oxide film system with the thickness of 0.01-500 μm or a polymer film system with the thickness of 0.01-500 μm.
According to the present invention, it is preferable that,
the metal film is selected from an Au film, an Ag film, a Pt film, a Cu film or an Al film;
the oxide film is selected from an In2O3 film, an In2O3 Sn film, a SnO2 film, a ZnO In (IZO) film, a ZnO Ga film, a ZnO Al film or a CdO film;
the polymer film is selected from a poly 3, 4-alkylenedioxythiophene film, a poly 3, 4-ethylenedioxythiophene film or a polystyrene sulfonic acid film.
According to the present invention, preferably, the active material is coated on one side or both sides of the surface of the transparent current collector film.
In the invention, the single-side coating can observe the intercalation state of lithium ions on the surface of the transparent current collector film, and also can observe the electrochemical state of the visual lithium ion electrode according to color change.
According to the present invention, preferably, the step of coating the active material on the surface of the transparent current collector thin film comprises: and forming a plurality of grooves with the same size on the surface of the transparent current collector film, and coating the active substance on the surface of the transparent current collector film.
In the invention, the groove is an etching groove or a concave-convex groove formed by etching, printing and other processes according to the material requirement of the transparent conductive film; the groove can not only increase the adhesion of the negative electrode active material or the positive electrode active material on the transparent conductive film, but also reduce the quality of the transparent conductive film and improve the energy density of the electrode.
According to the present invention, preferably, the depth and the width of the groove are both 0.02 to 0.05 times of the thickness of the transparent current collector film.
According to the present invention, it is preferable that,
the negative active material is at least one of lithium titanate, graphite, silica and silicon carbon;
the positive active material is at least one of lithium manganate, lithium cobaltate, lithium iron phosphate and lithium nickel cobalt manganese oxide.
The invention also provides application of the visual lithium ion electrode in a lithium ion battery.
The invention provides a visual lithium ion battery, which comprises one or more groups of positive electrodes and negative electrodes, electrolyte and a celgad diaphragm arranged between the positive electrodes and the negative electrodes; the positive electrode and the negative electrode are both the visual lithium ion electrode; the packaging of the lithium ion battery is full packaging by using a transparent battery packaging film, or after packaging by using an aluminum plastic film, a window is arranged on the aluminum plastic film, and the window part is packaged by using the transparent battery packaging film.
The invention provides a visual lithium ion battery, which comprises one or more groups of positive electrodes and negative electrodes, electrolyte and a diaphragm which is arranged between the positive electrodes and the negative electrodes; the negative electrode consists of a non-visual lithium ion negative electrode and a visual lithium ion negative electrode, and the positive electrode is a non-visual lithium ion positive electrode; after the non-visual lithium ion negative electrode and the non-visual lithium ion positive electrode are crossed and laminated, the visual lithium ion negative electrode is arranged on two sides of an electrode group after the crossed and laminated, and a diaphragm between the electrode group after the crossed and laminated and the visual lithium ion negative electrode is a celgad diaphragm; the packaging of the lithium ion battery is full packaging by using a transparent battery packaging film, or after packaging by using an aluminum plastic film, a window is arranged on the aluminum plastic film, and the window part is packaged by using the transparent battery packaging film.
In the present invention, the transparent battery sealing film is a transparent battery sealing film resistant to high temperature, acid, insulation, and pressure, and preferably, the transparent battery sealing film is at least one of a transparent polyimide film, a polyester film, a polyamideimide film, a polyetherimide film, and a thermoplastic polyurethane film.
The present invention is specifically illustrated by the following examples.
Example 1
This example is used to illustrate the visualized lithium ion positive electrode, the visualized lithium ion negative electrode and the visualized lithium ion battery of the present invention.
The current collector 122 of the visual lithium ion positive electrode 12 is In with a thickness of 100 μm2O3Sn film (ITO) and leaving positive tab 123; the transparent current collector 122 film needs to be coated with LiNi0.5Co0.2Mn0.3O2A plurality of grooves with the depth of 5 μm and the width of 5 μm are etched on the surface of the positive electrode active material 121, a single surface of the positive electrode active material 121 is coated on the surface of the transparent current collector 122 film with the grooves, and the film is baked in a vacuum oven at 70 ℃ for 24 hours to form the visual lithium ion positive electrode 12, as shown in fig. 1.
The current collector 112 of the visualized lithium ion negative electrode 11 was In having a thickness of 100 μm2O3Sn film (ITO) and leaving a negative electrode tab 113; etching a plurality of grooves with the depth of 5 micrometers and the width of 5 micrometers on the surface of the transparent current collector 112 film, which is required to be coated with the graphite negative electrode active material 111, coating one surface of the negative electrode active material 111 on the surface of the transparent current collector 112 film, which is provided with the grooves, and baking in a vacuum oven at 70 ℃ for 24 hours to form a visual lithium ion negative electrode 11, as shown in fig. 1.
The visual lithium ion battery 1 comprises a group of visual lithium ion positive electrodes 12 and visual lithium ion negative electrodes 11, wherein a diaphragm between the visual lithium ion positive electrodes 12 and the visual lithium ion negative electrodes 11 is a celgad diaphragm; fixing the visual lithium ion anode 12, the celgad diaphragm and the visual lithium ion cathode 11 by using a high-temperature, insulating and corrosion-resistant adhesive tape to form an electric core, drying the electric core in a vacuum oven at 70 ℃ for 24 hours, fully packaging the electric core by using a transparent polyimide film (PIC) in a hot pressing mode, simultaneously performing vacuum air extraction, and injecting electrolyte to obtain the visual lithium ion battery 1, wherein the visual lithium ion battery 1 is shown in figure 1.
Example 2
The embodiment provides a 3Ah composite pole piece visual lithium ion battery 2, wherein the battery 2 comprises 11 pieces of non-visual lithium ion positive electrodes 24 coated on two sides, 10 pieces of non-visual lithium ion negative electrodes 25 coated on two sides and 2 pieces of visual lithium ion negative electrodes 23 coated on one side;
the current collector 242 of the non-visual lithium ion anode is an aluminum foil, and the anode active material 241 is LiNi0.5Co0.2Mn0.3O2；
The current collector 252 of the non-visual lithium ion negative electrode is copper foil, and the negative electrode active material 251 is graphite;
the visual lithium ion negative electrode was the same as that of example 1.
After the non-visual lithium ion negative electrode 25 and the non-visual lithium ion positive electrode 24 are overlapped in a crossed manner, the visual lithium ion negative electrode 23 is arranged on two sides of the electrode group after being overlapped in a crossed manner, and a diaphragm between the electrode group after being overlapped in a crossed manner and the visual lithium ion negative electrode 23 is a celgad diaphragm;
and baking the battery core consisting of the electrodes in a vacuum oven at 70 ℃ for 24 hours, fully packaging the battery core by using a transparent polyimide film (PIC) in a hot pressing mode, simultaneously performing vacuum air suction, and injecting electrolyte to obtain the 3Ah composite pole piece visual lithium ion battery 2.
Example 3
The embodiment provides a visual lithium ion battery 3, wherein the battery 3 comprises 1 piece of visual lithium ion negative electrode 31 coated on two sides, 2 pieces of visual lithium ion positive electrode 32 coated on two sides and 2 pieces of visual lithium ion negative electrode 33 coated on one side, which is the same as that in the embodiment 1;
the double-sided coating step is to coat the same active substance on the other side of the visual lithium ion electrode coated on the single side.
Placing the two-sided coated visual lithium ion negative electrodes 31 between the two-sided coated visual lithium ion positive electrodes 32, placing the two single-sided coated visual lithium ion negative electrodes 33 which are the same as those in embodiment 1 on two sides of the two-sided coated visual lithium ion positive electrodes 32, wherein a diaphragm between the electrodes is a celgad diaphragm;
and (3) baking the battery core consisting of the electrodes in a vacuum oven at 70 ℃ for 24 hours, fully packaging the battery core by using a transparent polyimide film (PIC) in a hot pressing mode, simultaneously performing vacuum air suction, and injecting electrolyte to obtain the visual lithium ion battery 3, wherein the visual lithium ion battery is shown in figure 10.
Comparative example 1
The comparative example provides a non-visual lithium ion battery, which comprises 11 non-visual lithium ion anodes with double-side coating as in example 2 and 13 non-visual lithium ion cathodes with double-side coating as in example 2, wherein an electric core consisting of the electrodes is baked in a vacuum oven at 70 ℃ for 24 hours, then is fully packaged by an aluminum-plastic film in a hot pressing mode, and is simultaneously subjected to vacuum air exhaust and electrolyte injection to obtain the non-visual lithium ion battery.
Test example 1
Two visual lithium ion batteries 1 prepared in example 1 were taken, one of the visual lithium ion batteries was subjected to tubular pre-charging, and nitrogen was constantly pumped during the tubular pre-charging, so that it was observed that the negative active material changed from black to brown to yellow during charging, and the color recovered reversely during discharging. The other visual lithium ion battery is precharged without nitrogen gas extraction, and the process can be observed that the battery begins to swell along with the charging when the battery is charged to a certain degree, and the color change of the negative current collector surface of the visual lithium ion battery is not seen.
As can be seen from fig. 2, the charge/discharge capacities of the two lithium ion batteries were equivalent.
As can be seen from fig. 3, the voltage platforms of the two visualized lithium ion batteries have a large difference.
As can be seen from fig. 4, the visualized lithium ion battery without nitrogen gas extraction during the pre-charging process revealed uniform lithium deposition on the surface of the positive electrode after the battery was disassembled.
Test example 2
Both the 3Ah composite pole piece visual lithium ion battery 2 of example 2 and the non-visual lithium ion battery of comparative example 1 were subjected to EIS and HPPC tests, and the test results are shown in fig. 6 and 7. As can be seen from fig. 6, the difference in the internal resistances of the batteries of example 2 and comparative example 1 was small; as can be seen from fig. 7, the difference in battery power between example 2 and comparative example 1 is small.
In the test example, the 3Ah composite pole piece visual lithium ion battery 2 in example 2 is photographed by an optical microscope in a full-charge state before and after charging, as shown in fig. 8 and 9. Fig. 8 and 9 can observe bright yellow lithium ions on the negative electrode cross section of the 3Ah composite pole piece visualized lithium ion battery 2 of example 2 after charging.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A visual lithium ion electrode is characterized by comprising a transparent current collector film and a negative electrode active material or a positive electrode active material coated on the surface of the transparent current collector film.
2. The visual lithium ion electrode of claim 1,
the transparent current collector film is selected from a metal film system with the thickness of 8-12nm, an oxide film system with the thickness of 0.01-500 mu m or a polymer film system with the thickness of 0.01-500 mu m.
3. The visual lithium ion electrode of claim 2,
the metal film is selected from an Au film, an Ag film, a Pt film, a Cu film or an Al film;
the oxide film is selected from an In2O3 film, an In2O3 Sn film, a SnO2 film, a ZnO In (IZO) film, a ZnO Ga film, a ZnO Al film or a CdO film;
the polymer film is selected from a poly 3, 4-alkylenedioxythiophene film, a poly 3, 4-ethylenedioxythiophene film or a polystyrene sulfonic acid film.
4. The visual lithium ion electrode of claim 1,
the active substance is coated on one side or both sides of the transparent current collector film;
the step of coating the active material on the surface of the transparent current collector film comprises: and forming a plurality of grooves with the same size on the surface of the transparent current collector film, and coating the active substance on the surface of the transparent current collector film.
5. The visualized lithium ion electrode of claim 4, wherein the depth and width of the trench are both 0.02-0.05 times the transparent current collector film thickness.
6. The visual lithium ion electrode of claim 1,
the negative active material is at least one of lithium titanate, graphite, silica and silicon carbon;
the positive active material is at least one of lithium manganate, lithium cobaltate, lithium iron phosphate and lithium nickel cobalt manganese oxide.
7. Use of the visualized lithium ion electrode according to claims 1-6 in a lithium ion battery.
8. A visual lithium ion battery is characterized in that the battery comprises one or more groups of positive electrodes and negative electrodes, electrolyte and a celgad diaphragm which is arranged between the positive electrodes and the negative electrodes; the positive electrode and the negative electrode are both the visual lithium ion electrode as claimed in any one of claims 1 to 6; the packaging of the lithium ion battery is full packaging by using a transparent battery packaging film, or after packaging by using an aluminum plastic film, a window is arranged on the aluminum plastic film, and the window part is packaged by using the transparent battery packaging film.
9. A visual lithium ion battery is characterized in that the battery comprises one or more groups of positive electrodes and negative electrodes, electrolyte and a diaphragm which is arranged between the positive electrodes and the negative electrodes; the negative electrode consists of a non-visual lithium ion negative electrode and the visual lithium ion negative electrode in any one of claims 1 to 6, and the positive electrode is a non-visual lithium ion positive electrode; after the non-visual lithium ion negative electrode and the non-visual lithium ion positive electrode are crossed and laminated, the visual lithium ion negative electrode is arranged on two sides of an electrode group after the crossed and laminated, and a diaphragm between the electrode group after the crossed and laminated and the visual lithium ion negative electrode is a celgad diaphragm; the packaging of the lithium ion battery is full packaging by using a transparent battery packaging film, or after packaging by using an aluminum plastic film, a window is arranged on the aluminum plastic film, and the window part is packaged by using the transparent battery packaging film.
10. The visualized lithium ion battery of claim 8 or 9, wherein the transparent battery encapsulation film is at least one of a transparent polyimide film, a polyester film, a polyamideimide film, a polyetherimide film, and a thermoplastic polyurethane film.
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